https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77451
--- Comment #2 from Jonathan Wakely ---
This is a compiler bug not a library one:
int main()
{
auto l = [](auto&&...) {};
l();
}
l.cc: In function ‘int main()’:
l.cc:4:5: error: no match for call to ‘(main()::) ()’
l();
^
l.cc:3:24: note: candidate: template main()::::operator decltype (((const main()::*)((const
main()::*
const)0))->operator()(static_cast())) (*)(auto:1&&, ...)()
const
auto l = [](auto&&...) {};
^
l.cc:3:24: note: template argument deduction/substitution failed:
l.cc:4:5: note: candidate expects 1 argument, 0 provided
l();
^
l.cc:3:24: note: candidate: template main()::
auto l = [](auto&&...) {};
^
l.cc:3:24: note: template argument deduction/substitution failed:
l.cc:4:5: note: candidate expects 1 argument, 0 provided
l();
^
It works fine if you call it as l(1) or l(1, 2).
Not a regression, it's failed the same way since generic lambdas were added to
4.9
